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sched: optimize update_curr()

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Impact: micro-optimization

Skip the hard work when there is none.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-12-16 08:45:31 +01:00 committed by Ingo Molnar
parent 03e89e4574
commit 34f28ecd0f
1 changed files with 2 additions and 0 deletions
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2
kernel/sched_fair.c
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@ -492,6 +492,8 @@ static void update_curr(struct cfs_rq *cfs_rq)
* overflow on 32 bits): * overflow on 32 bits):
*/ */
delta_exec = (unsigned long)(now - curr->exec_start); delta_exec = (unsigned long)(now - curr->exec_start);
if (!delta_exec)
return;
__update_curr(cfs_rq, curr, delta_exec); __update_curr(cfs_rq, curr, delta_exec);
curr->exec_start = now; curr->exec_start = now;